Skiving apparatus



Sept. 20 i, 1927.

w. H. RAY ET AL.

SKIVING APPARATUS I *Filed 1366.1. 1924 2 sheets-sheet 1 William HRC?Marian S01 wn f Sepff 20 1927' w. H. RAY ET AL SKIVING APPARATUS FiledDeo.1. 1924' 2 sheets-sheep 2 Wzzzmmffi@ '50 bodying the invention ismounted Patented` Sept. 20, 1927.

4PAirENr.cerros. f

WILLIAM 1*HARRY RAY, or. CHICAGO, ann MARION .LLEWLLYN STMW,N.v mi. ,LA

GRANGEK,.-rr;r.-r1l\ors,AssreNoRsTo WESTERN nLEcrRrc A or NRW'YORK; N;Y.,A'coRroRAfrroR or New. YORK.

Application filed December Y,This invention relatesto a method of 'andy, apparatus" for skiving,y and more particularly to apparat-usfonskiv-ing fibrous material. Y lIlhe.primaryyobject'of thefinvent-ionis to provide ak-methodvandapparatus whereby .material maybeskivedaccurately and quick- ,lygwithout.injury thereto...Qne-,embodiment of theinvention vis em- -`ployed inthenramrfacture ofpapercones for yloud::speakers ofj thef'typeshown Aand `described in thecopending application of Norman .IIaRickeigV `Serial No: 592,675, `filed`October. 6,1922:` This embodiment of the inventionff comprises, a,slidefor. -carrying a blank fromwhicha cone is to befformed. A bar .monntedyupon Atheqslideholds one `edge of the blank. .in au position whereirritwill lbe engaged by a power-driven rotatable 'disk 2D of abrasivenmaterial :when ;tl1e"slid1e*is re ciprocatedythefdiskibeing adaptedto-skive or bevel 'the edge and being adjustable to a set angularposition togive the correct width andtaper to the-skive. An undercutshoulder formed upon the bar is adapted to hold an adjoining edge of theblank deflected out of the plane in which the first-mentioned edgeisdisposed so that it cannot be engaged and injured by the disk.

Other features of theV invention will become' apparent as thedetaileddescription progresses, reference being had to the accompanyingdrawings, wherein Fig. l is a plan View of apparatus embodying theinvention, a blank of the kind described above being shown in connectiontherewith; Y

Fig. 2 is a section taken substantially on line 2-2 of Fig. l;

Fig. 3 is an enlarged fragmentary plan view of a portion of the work asshown in Fig. 1;`

Fig. 4 is a section taken on line 4 4 Fig. 3;

Fig. 5 is a section taken on line 5 -5 of Fig. 2, and Fig. 6 is afragmentary view of the material corresponding to Fig. 3 with the guardomitted.

Referring to the drawings, apparatus emupon a f base 10 and comprises atable '11 slidably mounted upon the base by anti-friction devvices whichconsist of steel balls 12 interposed between the table and the base. Se-

25 is preferably provided with a oQivrPAnjr,rNcoRPoRArRD,

1-, 1924;'l-Seria1 No. x753,341.

cured. upon the upper surface of the tablelll is la-bar l5 which `hasone corner cut away `as at -l7to formfanundercut shouldervlS, the.purpose of which will presently appear. Theytablc'll may bereciprocated by theoperator, the travelY ofthe tablebeing limitedbybolts 20`and. 2l threaded into the base l0 kand ladapted to engageLstops 22 and 23; respectively,- secured to the yundersurface of thetable. Stops are fastenedto'th'efupper 'surface ofsthetable lltoaid-theuoperatorlin positioningarticles which are to {be-'skived.Y

Disposed above thetable ll'is a'diskl25 of abrasive' material rigidlyfsecured -to ashaft 26 rof an'electric motor-28 mounted vupon. a bracket30 i'vhiclris fpivotally.securedrtofw'a bracket 3l by a bolt-.83', thebracketlSLbeing .carriediby the; (base l0: Asfillustrate'dvin Fig. 2 thedisk 25 is adjustable to arset'anjgular position withrespect tothe axisofthe bolt: 33 and .may bei securediirthatiposition by the bolt 33 and abolt 35 threaded into a bracket 37 secured to the frame 10. The diskguard 40 carrying a resilient finger 42.

The above described embodiment of the invention is particularly adaptedto be employed in the manufacture of cones for loud speakers of the typeshown and described in I the aforementioned copending application. VEachof these loud speakers comprise a cone formed from a circular blank 45of paper illustrated in Fig. 6 from which a segment has been removed,the center of the blank being indicated by 'a relatively small aperture47 (Fig. l). It is to be noted-that the sectorV pending application ofWilliam H. Ray, Se-

Vsame thickness as the blank itself. In Fig. l

the edges 49 and 50 are shown as they appear after heilig skived.

In the operation of the apparatus, the disk 25 and the motor 28 arebrought into the positions wherein they are shown in dotted tricalenergltf to cause the disk to rotate Continuously. The blank is thenplaced upon the tablel 1l in the manner illustrated in Fig. l whereinthe edge 50 is aligned with `the left hand edge (Fig. l) of the bar 1.5and a portion of the edge et?) is inserted under the undercut` shoulder1S, the peripher;v of the disk being' engaged by the stops let. Theoperator the-n advances the blank and the table 1l to Yard the. bolt 2Oand the disk skires the edge .30. the disk 25 having been adj usted togive the correct width and taper to the skire. lt uill be noted that thedisk 25 cannot engage and injure the edge 9. Alter the edge 50 has beenskired the table l1 is returned to the. position wherein it is shown inFig. l and 4the blank 45 is turned over and so positionefl that its edge49 is aligned with the lett hand edge (Fig. l) ol' the bar l5 and itseda'e 50 is protected due to the raising' of the edge fil) by theundereut shoulder 18. The operator again advances the blank 4:5 and thetable l1 toward the bolt 20 to skiie the edge 49 and then returns thetable to the position wherein it is shown in Fig. l so that the blanknuitv be rernored from the table. In each of the skiving operations. theresilient linger 42 prevents the blank from buckling as it passesbeneath the disk Q5.

The use of the disk 25 of abrasive material is advantageous in that neatand accurate skives are fornied upon the paper blanks, a result whichcannot be obtained by the use of knives or rotary cutters. .ln practiceit has been found that even a sharp knife will tear the blank in suchmanner that a ragged skire is produced. It has also been 'found that thepaper frein which the blanks are formed contains an appreciable amountof gritty substances which rapidly dull tools harina' cutting' edges.These substances do not atleet the operation ol the disk 25 to anyappreciable extent as the disk may be dressed troni tinie to linie in a`manner well known to those skilled in the. art.

lllhat is claimed is:

1. ln an apparatus for skiving the edges olfV a slit in llexiblematerial to form a joint, a table for supporting the inaterial, a barfor aligning one edge of the slit and forming a recess with the table toreceive the other edge of the slit, and supporting the material adjacentsaid edge, and means for skiving the aligned edae.

9. A method of skiving an edge of a` slit.. which consists ot separatingthe edges of the slit, supporting' one edge of" the slit above the otheredge. and skiving a supported edge,

In witness whereof. We hereunto subscribe our names this 17th daj7 ofNovember A. D., 1924.

VILLIAM HARRY RAY. MARION LLEW'LLYN STRAVVN.

